For more information visit our website www.bussmann.com 1 High Voltage Fuse Technology End cap Porcelain barrel Fuse elements Granular Quartz Striker coil Expelled striker Star core Moisture tight seal Granular Quartz Fuse elements Porcelain barrel Cross Section Current Limiting For the protection of equipment operating above 1000 volts AC Silver ceramic point contact Star core Striker coil Current limiting HV fuse links split into three internationally recognised types: back-up (or partial range) fuse links, which will interrupt any current from their rated breaking capacity down to a minimum breaking current specified by the manufacturer; and general purpose fuse links, which will interrupt all currents from rated breaking capacity down to a current that will melt the elements within one hour. A third type is the full range fuse. This term applies to fuse links that can interrupt any current below the rated breaking capacity that melts the fuse elements satisfactorily. Current limiting back-up fuse links are the closest in construction to LV cartridge types. However, a longer strip element with many more restrictions is necessary to produce the large number of series arcs needed to interrupt a high voltage. Fuse manufacturers achieve this by coiling the element around a ceramic core with a star shaped cross section. In this way, a 1m long element can be fitted into a 250mm long fuse body. If the adjacent coils are too close, there will be a flashover between them and this sets a practical limit on how long an element can be crammed into a particular cartridge, and how many elements can be used in parallel. Like an LV cartridge fuse link, an HV fuse link of this type has a ceramic body. Many HV current limiting fuse links are also fitted with a striker mechanism. This not only provides the user with a visual indication that the fuse link has operated, but can also be used to operate other switchgear. In this way, a fuse on a single phase system can cut off all three phases if a fault occurs. Striker mechanisms are driven by explosive charges or compressed springs. Both are triggered by a thin fuse wire running the length of the fuse, usually through the centre of the star shaped core. The wire is connected in parallel with the elements, so a current flows through it when the elements melt. The current heats up the wire and detonates the explosive charge, or melts the wire andreleases the spring, pushing the striker pin out of the fuse link’s end cap. A lock washer mechanism makes it impossible to push the pin back into the fuse body. There are several variations on this design for specific applications. For example, the elements in three- phase motor protection fuse links are corrugated to withstand the cyclical mechanical stresses induced by the high starting and stopping currents drawn by the motor.
65
Embed
High Voltage Fuse Technology - Cooper · PDF fileCurrent limiting HV fuse links split into three internationally recognised types: back-up (or partial range) fuse links, ... High Voltage
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
For more information visit our website www.bussmann.com 1
High Voltage Fuse Technology
End cap Porcelain barrel
Fuse elements Granular Quartz Striker coil Expelled striker
Star core Moisture tight seal
GranularQuartz
Fuse elements
Porcelain barrel
Cross Section
Current Limiting
For the protection of equipment operating above 1000 volts AC
Silver ceramicpoint contact
Star coreStriker coil
Current l imit ing HV fuse l inks spl it into threeinternationally recognised types: back-up (or partialrange) fuse links, which will interrupt any currentfrom their rated breaking capacity down to a minimumbreaking current specified by the manufacturer; andgeneral purpose fuse links, which will interrupt allcurrents from rated breaking capacity down to acurrent that will melt the elements within one hour.A third type is the full range fuse. This term appliesto fuse links that can interrupt any current belowthe rated breaking capacity that melts the fuseelements satisfactorily.
Current limiting back-up fuse links are the closest inconstruction to LV cartridge types. However, a longer stripelement with many more restrictions is necessary toproduce the large number of series arcs needed tointerrupt a high voltage. Fuse manufacturers achievethis by coiling the element around a ceramic core with astar shaped cross section. In this way, a 1m long elementcan be fitted into a 250mm long fuse body. If the adjacentcoils are too close, there will be a flashover betweenthem and this sets a practical limit on how long anelement can be crammed into a particular cartridge, andhow many elements can be used in parallel.
Like an LV cartridge fuse link, an HV fuse link of thistype has a ceramic body.
Many HV current limiting fuse links are also fitted witha striker mechanism. This not only provides the userwith a visual indication that the fuse link has operated,but can also be used to operate other switchgear. Inthis way, a fuse on a single phase system can cut off allthree phases if a fault occurs.
Striker mechanisms are driven by explosive charges orcompressed springs. Both are triggered by a thin fusewire running the length of the fuse, usually through thecentre of the star shaped core. The wire is connected
in parallel with the elements, so a current flowsthrough it when the elements melt. The currentheats up the wire and detonates the explosivecharge, or melts the wire andreleases the spring,pushing the striker pin out of the fuse link’s endcap. A lock washer mechanism makes it impossibleto push the pin back into the fuse body.
There are several variations on this design for specificapplications. For example, the elements in three-phase motor protection fuse links are corrugated towithstand the cyclical mechanical stresses inducedby the high starting and stopping currents drawnby the motor.
2
High Voltage Fuse Technology
For more information visit our website www.bussmann.com
M- effect
Bussmann high voltage fuse links include M-effect as a design feature to enhance performance. M-effect
(named after its discoverer, Prof. Metcalf, in the late 1930s) consists of applying overlay spots of special low
melting alloy onto the fuse element strips. Its effect is to ensure that the fuse link runs cooler in service and
that the maximum temperature reached during fuse operation is kept down to a modest 160 deg. C
(compared with 300 - 400 deg C for fuse links which do not employ this feature).
M-effect has been in widespread use in both low voltage and high voltage fuse links of British design for
many years and is now coming into use in many other countries. Cooler running M-effect fuse links have
longer service life since lower surface temperature on the elements ensures against long term embrittlement
of the material. The M-effect spots are stable and have been proved by many tests to remain inert for
periods of 30 years or more.
The low maximum operating temperature of M-effect fuse links ensures safe operation of Back-up types in
striker tripped switchgear under low fault conditions. Whereas non M-effect types are known to have a risk
of body fracture because of their much higher body temperature under such conditions. The low maximum
operating temperature also ensures against damage to heat sensitive fuse enclosures such as cast resin
fuse pods.
In short, M-effect fuse links are safer, give better protection and are longer lasting than alternative designs
which do not employ this valuable feature.
Essentially, non-current limiting fuse links have shortelements and incorporate some means of lengtheningthe arc after the element melts, extinguishing the arcand preventing re-ignition. There are two distinct types:expulsion fuse links and liquid fuse links.Expulsion fuses are an effective way of protectingoverhead distribution lines and transformers. They aredesigned for outdoor use only and comprise a tin orcopper fuse element in series with a flexible braid in atube. The tube forms one side of a triangle, with alatched connection at the top and a hinge at thebottom. The braid emerges from one end of the fuselink and is held in tension by a spring.When the element melts, the braid is no longer undertension, the latch is released and the fuse swings
downwards under gravity, breaking the circuit. As thefuse swings downwards, the arc is lengthened,extinguished and prevented from restriking.Liquid fuse links are based on early non-currentlimiting fuse links which use liquids to quench the arc.The fuse element is anchored to the top ferrule of aglass tube filled with a quenching liquid - usually ahydrocarbon. The rest of the tube is filled with aspring that holds the element - or a strain wire in veryhigh voltage fuse links - in tension.When the element melts, the spring pulls the twoparts of the element apart, extending the arc andquenching it in the liquid.
Non- Current Limiting
For the protection of equipment operating above 1000 volts AC
3
DIN - Fuse Links
Fuse Links comply with DIN dimensional standard DIN43625.
‘F’ range, high performance full range fuse link.
‘S’ range, high performance back-up fuse link, with striker tripping.
‘A’ range, including high current rating back-up fuse link.
Comply with IEC 60282-1 and VDE 0670 part 4.
Wide variety of ratings, 3.6 kV to 36 kV.
Versions suitable for indoor and outdoor use.
Motor circuit fuse link option.
Bussmann DIN ‘S’ Fuse Links
The time current characteristics of the ‘S’ range is optimised to ensure improved discrimination with upstream devices and to give fast clearance of earth faults in the secondary terminal zones. The breaking performance with low over currents is adequate to cater for all normal distribution applications, where low voltage fuse links on the secondary side take care of low overload faults, leaving the high voltage fuse links to clear major faults ahead of LV protection. The fuse links are suitable for use even where there is no secondary LV protection, provided that they are used in fuse switches fitted with instantaneous striker tripping.
Bussmann DIN ‘F’ Fuse Links
The ‘F’ range fuse links have ‘full range’ clearing capability. Bussmann ‘F’ types are designed to clear all overloads right down to fuse’s rated current in accordance with latest IEC 282-1 requirements. They are thus suitable for use as a sole form of protection. ‘F’ range time current characteristics are especially advantageous for transformer protection applications.
Bussmann DIN ‘A’ Fuse Links
This earlier, well proven design, has values of minimum breaking current between the ‘S’ and ‘F’ range including higher current ratings.
For more information visit our website www.bussmann.com
4
DIN - Fuse Links
Part Number
CurrentRating
Length Diameter
ø
Un
kV
In
A
I1
kA mmm Ω W
A2s
mm
WeightBreakingCapacity
I3
A
MinimumBreaking Current
Cold resistance and watts loss in free air at rated current
Cold resistance and watts loss in free air at rated current
JouleIntergral
(I2t)
VoltageRating
MaximumTotal Clearing
Minimum Pre-Arcing kg
Notes
a) 17.5kV fuse links in 10/12 dimensions are offered, since some switchgear in the 10/12 series is suitable for use at higher voltages.
b) Fuse links listed are normally for indoor use but versions suitable for outdoor use are olso available in the same ratings and dimensions. For outdoor versions of the ‘S’ range, replace the ‘S’ with a ‘T’ when ordering - for example ‘TDLSJ’
c) * All the fuse link code references listed in the proceeding tables are for striker fitted versions, for non-striker versions please replace the letter ‘S’ with the letter ‘N’ in the code - for example ‘SDLNJ’. For further information on our parts referencing system, please refer to section 10 of this catalogue.
For more information visit our website www.bussmann.com
6
DIN - Fuse Links
6.3A
10A
16A
20A
25A
31.5A
40A
50A
63A
80A
100A
125A
160A
5
Time current characteristics for 7.2kV DIN Fuse Links, ‘S’ range, fuse types SDL, SFL
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
7
DIN - Fuse Links
6.3A
10A
16A
20A
25A
31.5A
40A
50A (S
DL
)
63A (S
DL
)
80A
100A
125A
160A
200A
5
Time current characteristics for 12kV DIN Fuse Links, ‘S’ range, fuse types SDL, SFL, SKL and SXL
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
8
6.3A
10A
16A
20A
25A
31.5A (S
DM
)
40A (S
DM
)
50A (S
FM
)
63A
80A/75A
100A (15.5kV
ON
LY)
125A (15.5kV
ON
LY)
5
DIN - Fuse LinksTime current characteristics for 15.5, 17.5kV DIN Fuse Links, ‘S’ range, fuse types SDL, SFL, SDM, SFM and SKM
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
9
DIN - Fuse Links
Time current characteristics for 24kV DIN Fuse Links, ‘S’ range, fuse types SDM, SXM and SFM
For more information visit our website www.bussmann.com
6.3A
10A
16A
20A
25A
31.5A
40A (S
DM
)
50A
63A
71A
80A
100A
125A
160A
5
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
10
DIN - Fuse LinksTime current characteristics for 36kV DIN Fuse Links, ‘S’ range, fuse types SDQ, SFQ and SXQ
5
6.3A
10A
16A
20A
25A
31.5A
40A
50A
63A (S
XQ
)
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
11
DIN - Fuse Links
Time current characteristics for 12kV DIN Fuse Links, ‘F’ range, fuse types FDL, FFL and FXL
1 HO
UR
100A
80A
63A
50A
40A
31.5A
25A
20A
16A
10A
6.3A
5
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
12
DIN - Fuse LinksTime current characteristics for 24kV DIN Fuse Links, ‘F’ range, fuse types FDM and FFM
1 HO
UR
45A
40A
31.5A
25A
20A
16A
10A
6.3A
5
43
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
13
DIN - Fuse Links
Dimensions (mm)
Please refer to the ‘how to order’ page 61 of this catalogue for further details of how ordering codes are formatted
E = Spring Striker 80N to IEC 60282-1designation ‘medium’
S = Spring Striker 50N to DIN 43625 and IEC 60282-1 designation ‘medium’
For more information visit our website www.bussmann.com
14
DIN - Fuse Links
Min Max Min Max Min Max
Transformer Primary Voltage
TranformerRating
(kVA)
10(kV)
20(kV)
30(kV)
Rated Current of theHigh Voltage Fuse Link
Rated Current of theHigh Voltage Fuse Link
Rated Current of theHigh Voltage Fuse Link
50100125160200250315400500630800
1000
80125160200250315400500630800
10001250
10162025
31.540506380
100125125
101625
31.531.550638080
100125125
6.3101016162025
31.540505063
6.31616162025
31.54050505071
3.156.36.3101616162025
31.54050
3.1510101016162025
31.5404050
Low Voltage
NH Fuse Size
gG/gL
(A)
General guide to the selection of DIN Fuse Links for use in the primary circuit of three phase transformers
1. The fuse link should withstand transformer magnetising inrush currents, taken as 12 times full load current for 0.1 seconds.
2. The fuse link should discriminate with the rating of secondary fuse link stated or where only individual cable exit protection exists, the highest rating likely to be used.
3. The fuse link should operate within 2 seconds for transformers complying with IEC60076 - 5 in respect of impedance, voltage and short circuit withstand current.
4. The fuse link should operate reasonably quickly in the event of a transformer internal fault, or an earth fault in the secondary terminal zone of the transformer.
5. In the case where there is no secondary fuse link for overload protection, the minimum recommended HV fuse link rating applies to the use of fuse links in encapsulated enclosures where permissible continuous overload is generally limited to 20% of transformer full load current. However if greater overload currents are permissible a higher rating of fuse link may be required. Where the fuse link is used in open air or conditions of unrestrictedventilation a higher permissible overload may be possible.
6. In most cases more than one rating of HV fuse link is recommendedfor a particular transformer size. Choice of fuse link will then depend on which fuse offers the best protection e.g. having one fuse for several transformer sizes.
Recommendations for other voltages are available on request.
For HV DIN Fuse Links type SXLSJ, SDLSJ, SFLSJ, SKLSJ, SDMSJ, SFMSJ, SXMSJ SDQSJ, SFQSJ. Selection guideusing LV Fuse Links operating class gG/gL on the low voltage side for overload protection of the transformer.
Selection of these HV fuse links has been based on the following:
Min Max Min Max Min Max
Transformer Primary Voltage
TranformerRating
(kVA)
10(kV)
20(kV)
30(kV)
Rated Current of theHigh Voltage Fuse Link
Rated Current of theHigh Voltage Fuse Link
Rated Current of theHigh Voltage Fuse Link
50100125160200250315400500630800
1000125016002000
6.31616162025
31.540506380
100125160200
101625
31.531.550638080
100125125200200200
6.36.310101616202025
31.540506371100
6.31616162025
31.54050505071
100100160
3.156.36.36.310101616162025
31.5405063
3.1510101016161625
31.5404050506363
For HV DIN Fuse Links type SXLSJ, SDLSJ, SFLSJ, SKLSJ, SDMSJ, SFMSJ, SXMSJ SDQSJ, SFQSJ. Selection guideusing LV Fuse Links operating class gG/gL on low voltage side for individual cable exit protection.
For more information visit our website www.bussmann.com
Sel
ecti
on
Tab
le f
or
Bac
k-up
Fus
e Li
nks
Sel
ecti
on
Tab
le f
or
Bac
k-up
Fus
e Li
nks
15
DIN - Fuse Links
Min Max Min Max
Transformer Primary Voltage
TranformerRating
(kVA)
10(kV)
20(kV)
Rated Current of theHigh Voltage Fuse Link
Rated Current of theHigh Voltage Fuse Link
50100125160200250315400500630800
1000
6.31016162025
31.540506380
100
102025
31.540506380
100100100100
6.36.36.3101016162025
31.54045
6.31016162025
31.54045454545
General guide to the selection of DIN Fuse Links for use in the primary circuit of three phase transformers
For HV DIN fuse links type FDLSJ, FFLSJ, FXLSJ, FDMSJ, FFMSJ. Selection guide using LV fuse links operatingclass gG/gL on low voltage side for individual cable exit protection.
For more information visit our website www.bussmann.com
Min Max Min Max Min Max
Transformer Primary Voltage
TranformerRating
(kVA)
10(kV)
20(kV)
30(kV)
Rated Current of theHigh Voltage Fuse Link
Rated Current of theHigh Voltage Fuse Link
Rated Current of theHigh Voltage Fuse Link
Low Voltage
NH Fuse Size
gTr
(A)
100125160200250315400500630800
1000
1001251602002503154005006308001000
16162025
31.540506380100125
161625
31.540506380
100125160
10101616162525
31.5406363
101016162525
31.540506380
6.310101616202525
31.54040
6.3101016202525
31.5405050
For HV DIN fuse links type SXLSJ, SDLSJ, SFLSJ, SKLSJ, SDMSJ, SFMSJ, SXMSJ SDQSJ, SFQSJ. Selection guideaccording to DIN VDE 0670 part 402 using LV fuse links operating class gTr on low voltage side for overloadprotection of the transformer.
1. The fuse link should withstand transformer magnetising inrush currents, taken as 12 times full load current for 0.1 seconds.
2. The fuse link should discriminate with the rating of secondary fuse link stated or where only individual cable exit protection exists, the highest rating likely to be used.
3. The fuse link should operate within 2 seconds for transformers complying with IEC60076 - 5 in respect of impedance, voltage and short circuit withstand current.
4. The fuse link should operate reasonably quickly in the event of a transformer internal fault, or an earth fault in the secondary terminal zone of the transformer.
5. In the case where there is no secondary fuse link for overload protection, the minimum recommended HV fuse link rating applies to the use of fuse links in encapsulated enclosures where permissible continuous overload is generally limited to 20% of transformer full load current. However if greater overload currents are permissible a higher rating of fuse link may be required. Where the fuse link is used in open air or conditions of unrestrictedventilation a higher permissible overload may be possible.
6. In most cases more than one rating of HV fuse link is recommendedfor a particular transformer size. Choice of fuse link will then depend on which fuse offers the best protection e.g. having one fuse for several transformer sizes.
Recommendations for other voltages are available on request.
Selection of these HV fuse links has been based on the following:
Sel
ecti
on
Tab
le f
or
Bac
k-up
Fus
e Li
nks
Sel
ecti
on
Tab
le f
or
Full
Ran
ge
Fuse
Lin
ks
16
DIN - Fuse Links
Min Max Min Max
Transformer Primary Voltage
TranformerRating
(kVA)
10(kV)
20(kV)
Rated Current of theHigh Voltage Fuse Link
Rated Current of theHigh Voltage Fuse Link
100125160200250315400500630800
1000
100125160200250315400500630800
1000
101616202540405080
100100
2025
31.540506380100100100100
6.3101016202025
31.54045-
1016162025
31.540454545-
Low Voltage
NH Fuse Size
gTr
(kVA)
General guide to the selection of DIN Fuse Links for use in the primary circuit of three phase transformers
For fuse links type FDLSJ, FFLSJ, FXLSJ, FDMSJ, FFMSJ. Selection guide according to DIN VDE O670 part 402using LV fuse links operating class gTr on low voltage side for overload protection of the transformer.
Min Max Min Max
Transformer Primary Voltage
TranformerRating
(kVA)
10(kV)
20(kV)
Rated Current of theHigh Voltage Fuse Link
Rated Current of theHigh Voltage Fuse Link
50100125160200250315400500630800
801251602002503154005006308001000
6.310161620
31.5404050100100
6.3101620
31.540406363
100100
6.310101616162025
31.540-
6.3101016162020
31.54045-
Low Voltage
NH Fuse Size
gG/gL
(A)
For HV DIN fuse links type FDLSJ, FFLSJ, FXLSJ, FDMSJ, FFMSJ. Selection guide using LV fuse links operatingclass gG/gL on low voltage side for overload protection of the transformer.
1. The fuse link should withstand transformer magnetising inrush currents, taken as 12 times full load current for 0.1 seconds.
2. The fuse link should discriminate with the rating of secondary fuse link stated or where only individual cable exit protection exists, the highest rating likely to be used.
3. The fuse link should operate within 2 seconds for transformers complying with IEC60076 - 5 in respect of impedance, voltage and short circuit withstand current.
4. The fuse link should operate reasonably quickly in the event of a transformer internal fault, or an earth fault in the secondary terminal zone of the transformer.
5. In the case where there is no secondary fuse link for overload protection, the minimum recommended HV fuse link rating applies to the use of fuse links in encapsulated enclosures where permissible continuous overload is generally limited to 20% of transformer full load current. However if greater overload currents are permissible a higher rating of fuse link may be required. Where the fuse link is used in open air or conditions of unrestrictedventilation a higher permissible overload may be possible.
6. In most cases more than one rating of HV fuse link is recommendedfor a particular transformer size. Choice of fuse link will then depend on which fuse offers the best protection e.g. having one fuse for several transformer sizes.
Recommendations for other voltages are available on request.
Selection of these HV fuse links has been based on the following:
For more information visit our website www.bussmann.com
Sel
ecti
on
Tab
le f
or
Full
Ran
ge
Fuse
Lin
ksS
elec
tio
n Ta
ble
fo
r Fu
ll R
ang
e Fu
se L
inks
17
Motor Fuse Links
Bussmann Motor Fuse Links
The Bussmann range of motor fuse links are designed to meet the specific requirements necessary for motor protection. During the starting cycle of direct on-line motors, the fuse elements will reach a considerably higher temperature than during normal operation; (this is due to the the high amount of current the motor will draw as it starts,typically, 6 times its normal load current value). This results in expansion and contraction of the fuse elements and could cause premature operation of the fuse.
Bussmann motor fuse links encompass an advanced design to minimise this effect. This therefore, negates the need to over specify the fuse rating due to high values of of motor starting current.
Bussmann motor fuse links operate extremely quickly under heavy fault currents, resulting from the time / current characteristic. Low power dissipation ensures low temperature rise, important in multi-tier starters for example. Switching (Arc), voltages are lower than permitted values, therefore, 5.5kV fuses are also suitable for 4.8kV and 2.4kV circuits.
Motor fuse links comply with IEC60282-1, IEC644 and BS5907.
Available in DIN 43625 and BS2692 dimensions.
Sold in a wide range of ratings from: 3.6 kV – 5 to 450 A 7.2 kV – 5 to 355 A
North American dimensioned products also available. 2R to 24R ratings.
DIN Dimensioned Motor Fuse Links
British Standard Motor Fuse Links North American Motor Fuse Links
For more information visit our website www.bussmann.com
Application
Fuse Links provide short circuit protection in motor circuits to both the motor starter and cables from the starter to the motor.Overload protection is provided by the motor starter, generally by an overload relay and contactor. Combination striker trippingmay also form part of associated equipment which houses the fuse links and motor starters.
Application Procedure
For any motor the fuse current rating is determined by magnitude and duration of starting current, except in a few situationswhere the starting currents are very light. The fuse current rating should therefore be selected as follows:
Direct-on-line Starting
In the absence of specific information the starting current can usually be taken to be six times the motor’s full load current.The starting time will depend on the type of the drive but will be approximately as follows:
Pump Motors - 6 seconds
Mill Motors - 10 to 15 seconds
Fan Motors - 60 seconds
These are average values and the appropriate figures for starting current and starting time for actual installation should be obtainedwherever possible.
Multiply the starting current by 1.7 and using this value of current and the starting time, (it is recommended that a minimumtime of 5 seconds be adopted), plot this point on the time-current characteristics of the fuse link. The correct current ratingof the fuse is then chosen as being the one immediately to the right of the point so plotted. The chosen fuse must also havea current rating of at least 1.3 times the full-load current of the associated motor.
The rating chosen will be adequate for normal applications where the associated motor is not started more than twice in givenperiod of one hour.
For applications using more frequent starting duties, a greater derating factor must be applied as shown in the following table.
Assisted Starting
A similar method of fuse selection may be used as for direct-on-line starting (see above), but it must be noted that thenormal running current of the motor is likely to be closer in value to the nominal current rating of the fuse than for direct-on-line applications.
The rating of fuse chosen will need to be appreciably greater than the motor running current to allow for restricted cooling insidecontrol gear cubicles, particularly where multi-tier starters are involved. In case of doubt refer to Bussmann for further guidance.
Note
For applications involving more frequent starting duties than 16 times per hour or where unusual duty cycles are involved,consult Bussmann application engineers for advice.
18
Motor Fuse Links
Maximum 2 starts per hour - Derating factor 1.7 Maximum 8 starts per hour - Derating factor 2.1
Maximum 4 starts per hour - Derating factor 1.9 Maximum 16 starts per hour - Derating factor 2.4
For more information visit our website www.bussmann.com
19
Motor Fuse Links
WDOH6 fuse links also available in the range 6.3 to 40A as code ADOH6.
Cold resistance and watts loss in free air at rated current
JouleIntergral
(I2t)
VoltageRating
MaximumTotal Clearing
Minimum Pre-Arcing kg
Selection Tables
Table of ratings for motor fuses 3.6 - 7.2kV to British Standard dimensions
For more information visit our website www.bussmann.com
20
Motor Fuse Links
Higher Current Ratings
Higher ratings than those tabulated above can be obtained by using fuse links connected in parallel. Special fixing arrangements forconnecting up to 3 fuse links in parallel, are available. Please contact Bussmann application engineers for more details. The codedesignations for these arrangements are given in ‘How to Order’ (page 61), dimensional drawings are given on page 26.
Selection Tables
Table of ratings for motor fuses 3.6 - 7.2kV to DIN dimensions
Cold resistance and watts loss in free air at rated current
JouleIntergral
(I2t)
VoltageRating
MaximumTotal Clearing
Minimum Pre-Arcing kg
Table of ratings for motor fuses 2.75 - 5.5kV to USA dimensions
2.75VFRHA*R2.75VFRHA*R2.75VFRHA*R2.75VFRHA*R
2.75VKRHA*R2.75VKRHA*R
2.75VKRHK*R2.75VKRHK*R
5.5VFNHA*R5.5VFNHA*R5.5VFNHA*R5.5VFNHA*R
5.5VKNHA*R5.5VKNHA*R
5.5VKNHK*R5.5VKNHK*R
2.752.752.752.75
2.752.75
2.752.75
5.55.55.55.5
5.55.5
5.55.5
2R3R4R6R
9R12R
18R24R
2R3R4R6R
9R12R
18R24R
60606060
6060
6060
60606060
6060
6060
180229257525
500500
500500
180229257525
500500
500500
6.154.042.691.62
1.151.03
0.5770.514
8.355.483.652.31
1.631.45
0.8150.725
52576265
7080
140156
70778591
99110
198220
276276276276
276276
276276
403403403403
403403
403403
8.1x103
1.9x104
4.2x104
3.9x104
8.8x104
1.1x105
3.5x105
4.5x105
8.1x103
1.9x104
4.2x104
3.9x104
8.8x104
1.1x105
3.5x105
4.5x105
2.8x104
7.5x104
1.4x105
3.4x105
8.4x105
1.2x106
3.2x106
5.5x106
2.8x104
7.9x104
1.6x105
3.6x105
8.8x105
1.3x106
3.4x106
5.8x106
76767676
7676
7676
76767676
7676
7676
2.52.52.52.5
2.52.5
5.25.2
3.83.83.83.8
3.83.8
7.87.8
Part Number
CurrentRating
Length Diameter
ø
In
A
Un
kV
I1
kA mmm Ω W
A2s
mm
WeightBreakingCapacity
I3
A
MinimumBreaking Current
Cold resistance and watts loss in free air at rated current
JouleIntergral
(I2t)
VoltageRating
MaximumTotal Clearing
Minimum Pre-Arcing kg
For more information visit our website www.bussmann.com
21
Motor Fuse Links
Time current characteristics for 3.6kV Motor Fuse Links, fuse types ADL, WDL, WFL and WKL
6.3A
10A
16A
20A
25A
31.5A
40A
50A
63A
80A
100A
125A
160A
200A
250A
315A
400A
5
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
22
Motor Fuse LinksTime current characteristics for 3.6kV Motor Fuse Links, fuse types WDF, WFF and WKF
50A
63A
80A
100A
125A
160A
200A
250A
315A
400A
5
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
23
Motor Fuse Links
Time current characteristics for 3.6kV Motor Fuse Links, fuse types WFG and WKG
For more information visit our website www.bussmann.com
31.5A
40A
50A
63A
80A
100A
125A
160A
200A
250A
315A
355A
400A
450A
5
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
24
Motor Fuse LinksTime current characteristics for 7.2kV Motor Fuse Links, fuse types WFN, WKN, WFM and WKM (* only WKM)
25A
31.5A
40A
50A
63A
80A
100A
125A
160A
200A
224A
250A
315A
355A (W
KM
)*
5
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
25
Motor Fuse Links
Dimensions (mm)
FUSE LINK TYPE
WDOSJWDLSJWFOSJWFLSJWKLSJWFMSJWKMSJ
A
192292192292292442442
D
51517676767676
Fuse Link type: DIN
FUSE LINK TYPE
+WJON6 WDO*H6WFO*H6
A
257261261
B
235235235
C
192192192
D
365176
E
9.510.510.5
F
131320
G
252564
H
232942
J
2.42.62.6
Fuse Link type: Tag Type “6” - BS 2692 Standard
+ Fuse type not available withstriker
26mm maximum travel after operation
Fuse type: WJO
min 10 to max 16mm travel after operation
Fuse type: WDO, WFO
Dimensions in mm
For more information visit our website www.bussmann.com
26
Motor Fuse Links
Fuse Link type: Tag Type “0” - BS 2692 Standard
FUSE LINK TYPE
WDFHOWFFHOWKFHOWFGHOWKGHOWFNHOWKNHO
A
337337337442442486486
B
305305305410410454454
C
254254254359359403403
D
51767676767676
Triple barrel fuse link (3rd barrel shown dotted) with 03 tags.
Double barrel fuse link with 02 tagsshown in full lines.
Dimensions (mm)
min 10 to max 16mm travel after operation
min 10 to max 16mm travel after operation
For more information visit our website www.bussmann.com
For more information visit our website www.bussmann.com27
Motor Fuse Links
Fuse Link type: USA Motor
FUSE LINK TYPE
VFRHAVKRHAVKRHKVFNHAVKNHAVKNHK
A
276276276403403403
76
A
80 M
ax10 Min - 16 Max striker travel after operation if fitted
76
K Tags (Double barrel fuse links)
76
A
85 160
10 Min - 16 Max striker travel after operation if fitted10 Min - 16 Max striker travel after operation if fitted
A Tags (ferrule)
K Tags (Double barrel fuse links)
FUSE LINK TYPE
VFRHAVKRHAVKRHKVFNHAVKNHAVKNHK
A
276276276403403403
Dimensions (mm)
For more information visit our website www.bussmann.com27
Motor Fuse Links
Fuse Link type: USA Motor
FUSE LINK TYPE
VFRHAVKRHAVKRHKVFNHAVKNHAVKNHK
A
276276276403403403
76
A
80 M
ax10 Min - 16 Max striker travel after operation if fitted
76
K Tags (Double barrel fuse links)
76
A
85 160
10 Min - 16 Max striker travel after operation if fitted10 Min - 16 Max striker travel after operation if fitted
A Tags (ferrule)
K Tags (Double barrel fuse links)
FUSE LINK TYPE
VFRHAVKRHAVKRHKVFNHAVKNHAVKNHK
A
276276276403403403
Dimensions (mm)
28
Voltage and Auxiliary Transformer Fuse Links
For more information visit our website www.bussmann.com
Bussmann manufacture a wide range of voltage transformer (VT) fuse links. In North America they are referred to as Potential Transformer fuses. These fuse links are designed for use in the primary side of voltage transformers to provide system isolation in the event of faults occurring in the transformer circuit.
Voltage transformer fuse links, have a preferred current rating of 3.15A. Experience has shown that there is a risk of spurious operation by transient overcurrents where lower current ratings are used. In addition, in order to minimise the risk of deterioration of the fine fuse elements caused by corona, it is desirable to mount the fuse links so that the earthed metal is not in the immediate vicinity of the part of the barrel between the ferrules.
Higher current and ‘E’ ratings are available for special applications, including auxiliary transformers.
A range of VT fuse links with a breaking capacity of 200kA for use at the output terminals of large turbo alternators can also be ordered. For further information, please contact Bussmann application engineers.
Types prefixed ‘A’ or ‘N’ are suitable for use in Air only. Types prefixed ‘O’ may be used under oil.
For DIN dimensioned voltage transformer and auxiliary transformer fuse links, please refer to DIN dimensioned fuse link section.
British Standard VT Fuse Links.
A range of voltage transformer primary Fuse Links to BS2692-1 and IEC60282-1.
Wide range of ratings from 1 kV to 36 kV.
3.15 Amp industry standard current ratings.
CAV range with ratings from 3.6kV to 38kV.
Bussmann Voltage and Auxiliary Transformer Fuse Links
For more information visit our website www.bussmann.com29
Voltage and Auxiliary Transformer Fuse Links
The last letter of the ordering code on these items is normally either ‘A’ or ‘22’, please refer to ‘how to order’ page 61 for an explanation.
Table of ratings for voltage transformer fuses 1.1 - 36kV
8mm bolt with BSW thread
Selection Table
*
Ferrule Fuse Link Tag type “A” shown in full lines and “22” Tag shown in dotted lines
30
Voltage and Auxiliary Transformer Fuse Links
For more information visit our website www.bussmann.com
* Curve valid
for all 3.15A ratings show
n in the selection table.
† Curve valid
for all 6.3A ratings show
n in the selection table.
Time current characteristics for 3.6 to 36kV VT Fuse Links of 3.15, 6.3 and 10 Amp ratings
1 HO
UR
10A
6.3A
3.15A*
5
3 4
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com31
Voltage and Auxiliary Transformer Fuse Links
Time current characteristics for E rated 5.5kV VT Fuse Links, fuse type ABWNA (minimum melting times)
1
0.5E
1E
2E
3E
4E
5E
10080
605040
30
20
108
54
3
2
1.8
.6
.5
.4
.3
.2
.1.08
.06
.05
.04
.03
.02
.01
2 3 4 5 6 8 10 200
300
400
500
0.5 20 30 40 50 60 80 100
TIME
IN S
EC
ON
DS
RMS SYMMETRICAL CURRENT IN AMPS
32
Voltage and Auxiliary Transformer Fuse Links
For more information visit our website www.bussmann.com
Time current characteristics for E rated 5.5kV VT Fuse Links, fuse type ABWNA (maximum melting times)
10080
605040
30
20
108
54
3
2
1.8
.6
.5
.4
.3
.2
.1.08
.06
.05
.04
.03
.02
.01
2 3 4 5 6 8 10 200
300
400
500
0.5 20 30 40 50 60 80 100
TIME
IN S
EC
ON
DS
RMS SYMMETRICAL CURRENT IN AMPS
0.5E
1E
2E
3E
4E
5E
For more information visit our website www.bussmann.com33
Voltage and Auxiliary Transformer Fuse Links
Time current characteristics for E rated 5.5kV VT Fuse Links, fuse type AMWNA (minimum melting times)
10080
605040
30
20
108
54
3
2
1.8
.6
.5
.4
.3
.2
.1.08
.06
.05
.04
.03
.02
.01
2 3 4 5 6 8 10 200
300
400
500
0.5 20 30 40 50 60 80 100
TIME
IN S
EC
ON
DS
RMS SYMMETRICAL CURRENT IN AMPS
0.5E
1E
2E
3E
5E
34
Voltage and Auxiliary Transformer Fuse Links
For more information visit our website www.bussmann.com
Time current characteristics for E rated 5.5kV VT Fuse Links, fuse type AMWNA (maximum melting times)
10080
605040
30
20
108
54
3
2
1.8
.6
.5
.4
.3
.2
.1.08
.06
.05
.04
.03
.02
.01
2 3 4 5 6 8 10 200
300
400
500
0.5 20 30 40 50 60 80 100
TIME
IN S
EC
ON
DS
RMS SYMMETRICAL CURRENT IN AMPS
0.5E
1E
2E
3E
5E
For more information visit our website www.bussmann.com35
Voltage and Auxiliary Transformer Fuse Links
These Voltage Transformer fuse links are available in the ratings shown in the table above. CAV fuse links are suitable forindoor use in air only. Type CAVH Fuse links are fitted with striker pins which may be used for indication purposes.
Current Limiting Fuse Links for use in Oil Switchgear
For more information visit our website www.bussmann.com
Fuse Links comply with IEC 282-1, BS2692-1and ESI Standard 12-8.
7.2 and 12kV Fuse Links tested at highestsystem voltage and approved by the UKElectricity Association approvals panel.
Voltage ranges 3.6 to 24kV.
Fitted with powerful pyrotechnic striker pin.
Bussmann under oil Fuse Links
The Bussmann range of oil tight fuse links are designed for use in oil filled switchgear. This type was pioneered inthe U.K. and the Bussmann range has been in continuous manufacture for almost 40 years, being by far the mostwidely used device of its kind in the world. Over 1,000,000 Bussmann branded fuse links have been put into servicewithout a single reported case of oil ingress. A unique triple seal system ensures against long term sealdeterioration. Low power dissipation ensures cool running in oil filled switchgear.
The range is not suitable for use inside oil filled transformer tanks where high oil temperatures may be expected.
Current Limiting Fuse Links for use in Oil Switchgear
Dimensions (mm)
For more information visit our website www.bussmann.com37
Current Limiting Fuse Links for use in Oil Switchgear
Table of ratings for British Standard Oil tight fuses 3.6 - 24kV
38
Current Limiting Fuse Links for use in Oil Switchgear
Selection of these fuse links has been based on a compromise between the following:
1 Withstand against magnetising inrush current is taken as 12 times full-load current for 0.1 second.
2 Withstand against 150% permissible overload current. Recommendations marked with an asterisk or dagger have the following significance:
* Limited to permissible overload of 130%† Permits use of a 12kV OHFMA 80A fuse with a 1000 kVA transformer where permissible overload does not exceed 130%.
3 For 6.6kV systems, 12kV fuse links are recommended where possible in the interests of standardisation.
4 Wherever possible, 254mm long fuse links are offered rather than equivalent 359mm types.
5 The above recommendations are not generally applicable to transformers feeding motor circuits with starting currents in excess of the transformer full load current. In this event, please consult Bussmann application engineers.
General guide to the selection of Oil tight Fuse Links for use in the primary circuit of three phase transformers
200
250
300/315
400
500
630
750/800
1000
1250
1600
OEFMA
OEFMA
OEFMA
OEFMA
OEFMA
OEFMA
OLGMA
OLGMA
-
-
63
80
100
125
160
200
250
250*
-
-
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
-
-
OEFMA
OEFMA
OEFMA
OEFMA
OEFMA
OEFMA
OHGMA
OHGMA
OHGMA
-
31.5
40
50
63
71
100
125
140
160*
-
12
12
12
12
12
7.2
7.2
7.2
7.2
-
01
-
02
-
03
-
04
05
-
-
OEFMA
OEFMA
OEFMA
OEFMA
OEFMA
OEFMA
OHFMA
OGFMA
OGFMA
OLGMA
25
25
31.5
40
50
63
80
90†
100
125*
12
12
12
12
12
12
12
12
12
12
OEFMA
OEFMA
OEFMA
OEFMA
OEFMA
OEFMA
OEFMA
OHGMA
OHGMA
OLGMA
16
20
25
31.5
40
50
63
71
90
100*
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
TransformerkVA Product
CodeRating kV
3.3kV
Transformer Priority Voltage
CurrentRating (A)
ProductCode
Rating kV
6.6kV
CurrentRating (A)
ProductCode
ESI 12-8Ref.
Rating kV
11kV
CurrentRating (A)
ProductCode
Rating kV
13.8kV
CurrentRating (A)
For more information visit our website www.bussmann.com
39
Current Limiting Fuse Links for use in Oil SwitchgearTime current characteristics for 7.2kV Oil Fuse Links, fuse type OEF
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
40
Current Limiting Fuse Links for use in Oil SwitchgearTime current characteristics for 7.2kV Oil Fuse Links, fuse type OHG
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
41
Current Limiting Fuse Links for use in Oil SwitchgearTime current characteristics for 12kV Oil Fuse Links, fuse types OEF and OHF
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
42
Current Limiting Fuse Links for use in Oil SwitchgearTime current characteristics for 12kV Oil Fuse Links, fuse types OHG and OLG
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
43
Current Limiting Fuse Links for use in Oil SwitchgearTime current characteristics for 15.5kV Oil Fuse Links, fuse types OEF, OHG and OLG
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
44
Current Limiting Fuse Links for use in Oil SwitchgearTime current characteristics for 17.5kV Oil Fuse Links, fuse type OHG
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
45
Current Limiting Fuse Links for use in Oil SwitchgearTime current characteristics for 24kV Oil Fuse Links, fuse type OEG
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
46
Current Limiting Fuse Links for use in Air
For more information visit our website www.bussmann.com
High Voltage fuse links for use in Air, comply with BS 2962-1 dimensions.
Available in voltage ranges 3.6 to 72.5kV.
Full range performance option available at12kV and 24kV.
Wide variety of fixing arrangements available.
Powerful pyrotechnic striker fitted.
E-rated North American dimension productsalso available.
Suitable for indoor or outdoor use.
British Standard Range
Bussmann Fuse Links for use in air
The Bussmann range of fuse links for use in air are available in British Standard form, BS 2692, Part 1 1975. A numberof options are available, including full range capability, and alternative fixing arrangements such as different types oftag, studs and collars etc. Details are available on application. Higher current ratings can be obtained by using fuse linksin parallel and special fixing arrangements are available for this purpose.
Bussmann Air Range - USA Dimensions
A comprehensive range of 'E' rated North American Dimension fuse links for industrial applications is also available.These are the latest technology full range fuse links in USA Industrial Standard 2 inch and 3 inch diameter ferrule style.Extended ratings in double barrel assemblies; striker, indicator and tag versions are also available.
47
Current Limiting Fuse links for use in Air
For more information visit our website www.bussmann.com
Table of ratings for British Standard air fuses 3.6 - 72.5kV
*The last letter of the ordering code on these items describes the tag required, please refer to “How to order” (page 61)for an explanation.
48
Current Limiting Fuse links for use in Air
For more information visit our website www.bussmann.com
Notes
a) The fifth letter or number of the part reference denotes the end fixing arrangement.
b) There are a wide variety of end terminations available, the most popular types, some of which have dimensional references to BS2692: Part 1, are:
A No Tags - Ferrule - BS Ref. FA3 - ADIHA / BS Ref. FA4 - AFIHA / BS Ref. FA5 - AFKHA B Offset Tag, single bolt fixingC & D Special Offset Tags, two hole fixings for Brush fuse switch equipment, BS Ref. TA3.F & O Offset Tags two bolt fixing.49 Centre Tags, single bolt fixing for use in Fused End Boxes.6 Tags to BS2692-1 ref. TA3
Table of ratings for British Standard air fuses 3.6 - 72.5kV
49
Selection of these fuse links has been based on a compromise between the following:
1 The fuse links should withstand transformer magnetising inrush currents, taken as 12 times full load current for 0.1 seconds.
2 The fuse links should discriminate with the highest rating of secondary fuse link.
3 The fuse links should withstand periodic over-currents of up to 150% of transformer full load current.
4 The fuse links should operate reasonably quickly in the event of a transformer inter-turn fault or a fault in the secondary terminal zone of the transformer.
Notes
a) The above recommendations are not generally applicable to transformers feeding motor circuits with starting currents in excess of the rated current of the fuse. In this event, please consult Bussmann.
b) For 6.6kV transformers, 12kV Fuse Links are recommended, where the required current rating is available.
c) Where the transformer is not subjected to periodic over-currents, a lower fuse rating may be suitable, fuse ratings marked thus‚ ‘3’ are only suitable for use with the transformer sizes quoted, where significant over loading does not occur.
Fuse links for use in transformers with primary voltages of 3.3kV, 22kV and 33kV are available, please consultBussmann application engineers for further details and a recommendation.
General guide to the selection of Air Fuse Links for use in the primary circuit of three phase transformers
Current Limiting Fuse Links for use in Air
For more information visit our website www.bussmann.com
200
250
300/315
400
500
630
750/800
1000
1250
1500
BDG
BDG
BDG
BFG
BFG
BFG
BFG
BFG
BFG
BFG
31.5
40
50
63
80
90
125
140
160
1603
12
12
12
12
12
12
7.2
7.2
7.2
7.2
BDG
BDG
BDG
BDG
BDG
BFG
BFG
BFG
AKG
AKG
20
25
31.5
40
50
63
71
90
112
1253
12
12
12
12
12
12
12
12
12
12
BDG
BDG
BDG
BDG
BFG
BFG
BFG
BFG
BFG
-
20
25
31.5
40
50
63
63
85
853
-
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
15.5
-
TransformerkVA Fuse Type Rating kV
6.6kV
Transformer Priority Voltage
Current Rating(A)
Fuse Type Rating kV
11kV
Current Rating(A)
Fuse Type Rating kV
13.8kV
Current Rating(A)
50
Time current characteristics for 7.2kV Air Fuse Links, fuse types BDG and BFG
Current Limiting Fuse Links for use in Air
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
51
Time current characteristics for 12kV Air Fuse Links, fuse types BDG, BFG and AKG
Current Limiting Fuse Links for use in Air
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
52
Time current characteristics for 12kV Air Fuse Links, fuse type FFGN
Current Limiting Fuse Links for use in Air
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
53
Time current characteristics for 24kV Air Fuse Links, fuse types ADI and AFI
Current Limiting Fuse Links for use in Air
For more information visit our website www.bussmann.com
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
54
Time current characteristics for 24kV Air Fuse Links, fuse type FDI
Current Limiting Fuse Links for use in Air
PRE - ARCING TIME IN SECONDS
CU
RV
ES
RE
LATE TO
ME
AN
PR
E-A
RC
ING
TIME
WITH
TOLE
RA
NC
E +
10% O
N C
UR
RE
NT
RM
S S
YM
ME
TICA
L PR
OS
PE
CTIV
E C
UR
RE
NT IN
AM
PE
RE
S
For more information visit our website www.bussmann.com
55
Current Limiting Fuse Links for use in AirTime current characteristics for 36kV Air Fuse Links, fuse types ADI, AFI and AFK
For more information visit our website www.bussmann.com
10 Min - 16 Max striker travel after operation if fitted
10 Min - 16 Max striker travel after operation if fitted
10 Min - 16 Max striker travel after operation if fitted
C & D Tags
A Tags (ferrule)
F Tags
For more information visit our website www.bussmann.com
57
Liquid Fuse Links
Replacement liquid fuse links sizes 1, 2and 3.
Wide range of voltages 6.6kV up to75kV.
Current ratings from 2 up to 75 amps(including‚ ‘E’ rated option).
Standard and slow blow elementsavailable.
Rewiring kits available for sizes 2 and 3.
Size 1 full range cartridge fuse availabletype FDSH48.
Bussmann Liquid Fuse Links
Bussmann manufacture a range of liquid filled fuse links for use outdoors, on pole mounted equipment. Theyprovide a simple yet effective means of protection in distribution applications. However, it should be noted thatliquid filled fuse links were first put into service before HV fuse standards were introduced and are therefore notcovered by any present standard. They are principally for replacement purposes on existing systems.
General Description
The fuse body is of clear toughened glass to allow visual identification of a blown fuse element. Plated contactferrules are hermetically sealed onto each end of the tube. The replacement fuse element assembly is held undertension within the tube, which is filled with fuse arc quenching liquid. (A data sheet on this product is available,please contact Bussmann for details.) The upper end of the fuse link is sealed by a tin diaphragm. This is designedto rupture during operation, permitting venting of arc products.
The fuse link is sealed against the weather and has an indefinite service life, under normal conditions. The elementassembly is enclosed by a fibre sleeve. This assists in the process of arc extinguishing during operation.
Operation
When a fuse link operates under fault conditions, the element and connecting strain wire melt, the tension springthen pulls the lower contact and element assembly through the arc quenching liquid to the bottom of the fuse linkassembly. A specially shaped liquid director cone, fitted on the assembly, creates a turbulence in the liquid toensure rapid dispersal of arc products.
Replacement of the Fuse Element
Element replacement kits, complete with instructions, are available from Bussmann. We also advise that a minimumof one replacement kit be purchased with each order.
Note that Size 1 fuse links do not have replaceable elements.
For more information visit our website www.bussmann.com
58
Liquid Fuse Links
Selection Tables
The part number would be 33L3S25 meaning a fuse with a rated voltage of 33kV; L denoting a Liquid typefuse; 3 denoting size; S denoting slow blow and 25 indicating rated current in Amps.
For more information visit our website www.bussmann.com
Selection Table Dimensions
Ordering codes
33
-
-
-
-
Rating VoltageLiquid FuseDesignation SIze Characteristic Current
Meaning
Symbol
-
L
-
-
-
-
-
3
-
-
-
-
-
S
-
-
-
-
-
25
Fuse is rated at 33kV for use on 33kV systems
Denotes a Liquid fuse link
Indicates size
Indicates characteristics (F = standard; S = slow blow)
Current rating of the fuse link in Amps
1
2
2
3
3
Size Type Current Rating (Amps)
Table of Ratings
Standard
Standard
Slow
Standard
Slow
2E 3E 5E 7E 10E 20E
3 5 10 15 20 25
5 10 15 20 25
3 5 10 15 20 25 30 40 50 60 75
5 10 15 20 25 30 40 50 60 75
SizekV A B C ØD
6.6
7.5
11/12
15/23
33
44
66
3
1
2
3
1
2
3
3
3
249
238
338
338
327
427
427
503
655
38.1
-
-
38.1
-
-
38.1
38.1
38.1
203
203
292
292
292
381
381
457
609
42.8
23.9
30.2
42.8
23.9
30.2
42.8
42.8
42.8
59
Fuse Clips
Bussmann Fuse Clips
To complement the range of tag fixings offered by Bussmann, a range of fuse clips. These are suitable for use withBritish Standard, DIN dimensioned and VT ferrule style fuse links. The BS and DIN clips are rated up to 200 Amps.They are designed to be fitted onto insulated studs or directly onto a busbar.
Selection Table
For more information visit our website www.bussmann.com
DIN fuse links to 43 625
Voltage transformer and auxiliarytype fuse links
British standard fuse links
50.8mm (2”) dia
63.5mm (2.5”) dia
76.2mm (3”) dia
270303 or A3354745
A3354705
A3354710
A3354720
A3354730
Fuse Type Clip Reference
VT Fuse Clips for 25.4mm diameter.
DIN Standard Clips for ‘F’ and‚ ‘S’range fuse links.
BS Mounting Clips suitable for 50.8mmand 76.2mm Oil, Air and Motor FuseLinks up to 200A.
60
Fuse Clips
Dimensions (mm)
Material: Nickel silver alloyOrder as part number: A3354705
Dimensions (mm)
Material: Nickel plated copperOrder as part number: 270303
Dimensions (mm)
Suitable for use with all Bussmann DIN fuse links.Also suitable for use with other Bussmann fuselinks having type‚ ‘J’ end tags, to DIN 43 625,with maximum current rating of 200 amps.
Material: Nickel plated copperOrder as part number:
A3354745 for 45mm dia.A3354710 for 50.8mm dia.A3354720 for 63.5 mm dia.A3354730 for 76.2 mm dia.
For more information visit our website www.bussmann.com
Clips for 25.4mm VT fuse links
Clips for DIN fuse links
Clips for British Standard and DIN style fuse links
Dimensions (mm)
Fusedia. (D)
H W C
45
50.8
63.5
76.2
86
86
95
100
112
112
124
140
48
48
54
58
61
How to Order - Parts Referencing System
Introduction
Bussmann employ a common referencing system for all their current limiting HV powder fuses. Liquid Fuse Links, CAV fuse links,and fuse clips have their own reference. Please refer to the appropriate section for the applicable code reference.
This reference number should be quoted in all correspondence. For example, when ordering orprogressing an order or when making a technical enquiry.
kV 2nd Letter Barrel
Diameter (mm)
M = 20,6
B = 25,4
D = 50,8
E, H, L = 63,5
F, I, K = 76,2
X = 88
3rd Letter Barrel
Length (mm)
U = 86
W = 142
O = 192
C = 195
D = 203
F = 254
L = 292
G = 359
N = 403
M = 442
Q = 537
I = 565
K = 914
4th Letter Striker (mm)
S = Striker toDIN43625, form C, 50N
E= Striker toDIN43625, 80N
H or M = Striker toBS2692-1
N = None fitted
5th/6th letter and or digit - termination or fixing
A = No Tags. Ferrule diameter as the 2nd letter
B = Offset tag, single boltfixing
C and D = Tags toBS2692-1
F = Offset tag, double bolt fixing
J = Ferrule to DIN 43625
O = Tags to BS2692-1
6 = Tags to BS2692-1
22 = 5/16-BSW stud one end only
02/03 double and triple barrel fuse link
F2/F3 double and triple barrel varients
Amps A
A / B / D / N
V or W
F
O
S
T
fuse links for usein air
fuse links primarilyfor use in motorcircuits
fuse links with FullRangecharacteristics
fuse links sealedfor use in oilswitches
DIN Range
DIN Outdoor Range
Note:Most of these fuse types are suitable for outdoor use, refer toBussmann application engineers for further information.A variety of alternative tag arrangements are also available,details on request from Bussmann application engineers.
Part referencing system for current limiting fuse links
1st Letter General Type
For more information visit our website www.bussmann.com
62
How to Order - Parts Referencing System
Ordering Key
Part number 12BDGHC50 represents a fuse rated at 12 kV for use in Air (B), with a body diameter of 50.8mm (D), a barrellength of 359mm (G), a striker to BS2692-1 (H), a tag arrangement to BS2692-1 (C) and an Amp rating of 50A
1 > Voltage 5 > Striker information* * H or M = Pyrotechnic striker
2 > Type designation letter 6 > Tag information S = Spring striker 50N
3 > Barrel diameter 7 > Rated current E = Spring striker 80N
4 > Barrel length N = No striker fitted
Ordering code information Type designation
Rated voltage of the fuse link 12 · · · · · ·
Type of fuse link · B · · · · ·
Body diameter · · D · · · ·
Body length · · · G · · ·
Type of striker · · · · H · ·
Type of tag · · · · · C ·
Current rating · · · · · · 50
Complete Part Number 12 B D G H C 50
Rated voltage of the fuse in kV
The type of fuse link given by a single letter
Diameter of the fuse link barrel in mm denoted by a letter
Length of the fuse link barrel denoted by a letter
Striker information: type of striker (if fitted) denoted by a letter*
Tag information: type, if fitted, denoted by a letter
Current rating of the fuse link given in Amperes
MeaningSymbol
1 2 3 4 5 6 7
xx
xx
xx
x
For more information visit our website www.bussmann.com
For more information visit our website www.bussmann.com 63
How to Order - Parts Referencing System
Code ReferenceDescription Page No.
FFMSJ DIN 'F' Range (Full range fuse) 3
NBUN* Voltage and Auxiliary Transformer fuse link 29
OBCN* Voltage and Auxiliary Transformer fuse link 29
OBFN* Voltage and Auxiliary Transformer fuse link 29
OBGN* Voltage and Auxiliary Transformer fuse link 29
OBWN* Voltage and Auxiliary Transformer fuse link 29
OEFMA Current Limiting fuse link for use in oil switchgear 36
OEGMA Current Limiting fuse link for use in oil switchgear 36
OHFMA Current Limiting fuse link for use in oil switchgear 36
OHGMA Current Limiting fuse link for use in oil switchgear 36
OLGMA Current Limiting fuse link for use in oil switchgear 36
SDLSJ DIN 'S' Range 3
SDMSJ DIN 'S' Range 3
SDOSJ DIN 'S' Range 3
SFLSJ DIN 'S' Range 3
SFMSJ DIN 'S' Range 3
SFQSJ DIN 'S' Range 3
SKLSJ DIN 'S' Range 3
SKMSJ DIN 'S' Range 3
VFNHA Motor fuse link - USA dimensions 17
VKNHA Motor fuse link - USA dimensions 17
VKNHK Motor fuse link - USA dimensions 17
WDFHO Motor fuse link - British dimensions 17
WDLSJ Motor fuse link - DIN Dimensions 17
WDOH6 Motor fuse link - British dimensions 17
WDOSJ Motor fuse link - DIN Dimensions 17
WFFHO Motor fuse link - British dimensions 17
WFGHO Motor fuse link - British dimensions 17
WFLSJ Motor fuse link - DIN Dimensions 17
WFMSJ Motor fuse link - DIN Dimensions 17
WFNHO Motor fuse link - British dimensions 17
WFOH6 Motor fuse link - British dimensions 17
WFOSJ Motor fuse link - DIN Dimensions 17
WJON6 Motor fuse link - British dimensions 17
WKFHO Motor fuse link - British dimensions 17
WKGHO Motor fuse link - British dimensions 17
WKLSJ Motor fuse link - DIN Dimensions 17
* Tag Variations
64
How to Order - Parts Referencing System
For more information visit our website www.bussmann.com
WKMSJ Motor fuse link - DIN Dimensions 17
WKNHO Motor fuse link - British dimensions 17
2703 Fuse clip for DIN dimension fuse links 59
CAV Voltage and Auxiliary Transformer fuse link 35
CAVH Voltage and Auxiliary Transformer fuse link 35
L1,L2,L3,LF Liquid fuse link (standard blow) 57
L1,L2,L3,LS Liquid fuse link (slow blow) 57
A3354705 Fuse clip for VT fuse links 59
A3354710 Fuse clip for British Standard and DIN 50.8mm dia 59
A3354720 Fuse clip for British Standard and DIN 63.5mm dia 59
A3354730 Fuse clip for British Standard and DIN 76.2mm 59
A3354745 Fuse clip for British Standard and DIN 45mm dia 59
ABCNA Voltage and Auxiliary Transformer fuse link, plain ferrule 28
ABCN22 Voltage and Auxiliary Transformer fuse link, BSW 5/18" thread 28
ABFNA Voltage and Auxiliary Transformer fuse link, plain ferrule 28
ABGNA Voltage and Auxiliary Transformer fuse link, plain ferrule 28
ABWNA Voltage and Auxiliary Transformer fuse link, plain ferrule 28
ABWN22 Voltage and Auxiliary Transformer fuse link, BSW 5/18" thread 28
ABWNA Voltage and Auxiliary Transformer fuse link, US standard 28
ADFH* Current limiting fuse link for use in air 46
ADGH* Current limiting fuse link for use in air 46
ADIH* Current limiting fuse link for use in air 46
ADLSJ DIN 'A' range 3
ADOSJ DIN 'A' range 3
AFFH* Current limiting fuse link for use in air 46
AFIH* Current limiting fuse link for use in air 46
AFKH* Current limiting fuse link for use in air 46
AILSJ DIN 'A' range, with striker 3
AIMSJ DIN 'A' range, with striker 3
AKGH* Current limiting fuse link for use in air 46
AMWNA Voltage and Auxiliary Transformer fuse link, US standard 46
BDGH* Currrent limiting fuse link for use in air 46
BFGH* Current limiting fuse link for use in air 46
FDIH* Current limiting fuse link for use in air (full range) 46
FDLSJ DIN 'F' Range (Full range fuse) 3
FDMSJ DIN 'F' Range (Full range fuse) 3
FFGN49 Current limiting fuse link for use in air (full range) 46